Non-Mendelian Genetics

AP Biology· difficulty 2/5

Pink snapdragons from a cross of red (RR) × white (rr) snapdragons is an example of

  • A

    Incomplete dominance — heterozygote is intermediate

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  • B

    Codominance — both alleles fully expressed in the heterozygote

  • C

    Polygenic inheritance — multiple genes contribute additively

  • D

    Complete dominance — heterozygote matches dominant homozygote

Explanation

Heterozygote (Rr) shows a blend; neither allele fully dominates.

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